Move StartsWith[ASCII] to base namespace.

chrome/browser/net/chrome_network_delegate.cc

Index: chrome/browser/net/chrome_network_delegate.cc
diff --git a/chrome/browser/net/chrome_network_delegate.cc b/chrome/browser/net/chrome_network_delegate.cc
index 4953a723c0be1b94cbeacbbb1f9434a0b6732ac4..50f83bbeaafcc588fb4ff3b1cf12fbf181a885d5 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -187,7 +187,7 @@ bool CanRequestBeDeltaEncoded(const net::URLRequest* request) {
   for (size_t i = 0; i < arraysize(kEligibleMasks); i++) {
     const char *prefix = kEligibleMasks[i].prefix;
     const char *suffix = kEligibleMasks[i].suffix;
-    if (prefix && !StartsWithASCII(mime_type, prefix, kCaseSensitive))
+    if (prefix && !base::StartsWithASCII(mime_type, prefix, kCaseSensitive))
       continue;
     if (suffix && !EndsWith(mime_type, suffix, kCaseSensitive))
       continue;